QKD system with fast active optical path length compensation |
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Authors: | Byung Kwon Park Min Soo Lee Min Ki Woo Yong-Su Kim Sang-Wook Han Sung Moon |
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Institution: | 1.Center for Quantum Information,Korea Institute of Science and Technology,Seoul,Korea;2.Department of Nano-materials, Science and Engineering,Korea University of Science and Technology,Daejeon,Korea |
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Abstract: | We develop a quantum key distribution (QKD) system with fast active optical path length compensation. A rapid and reliable active optical path length compensation scheme is proposed and applied to a plug-and-play QKD system. The system monitors changes in key rates and controls it is own operation automatically. The system achieves its optimal performance within three seconds of operation, which includes a sifted key rate of 5.5 kbps and a quantum bit error rate of less than 2% after an abrupt temperature variation along the 25 km quantum channel. The system also operates well over a 24 h period while completing more than 60 active optical path length compensations. |
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